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Supplemental Financial Information Supplemental Financial Information (Narrative) (Details) - Sales Revenue, Services, Net [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Customer Concentration Risk [Member]
Concentration Risk, Percentage	100.00%	100.00%
Customer Concentration Risk [Member] | BP [Member]
Concentration Risk, Percentage	14.00%	13.00%
Geographic Concentration Risk [Member]
Revenues	$ 814.0	$ 1,163.9
Floaters [Member] | Customer Concentration Risk [Member] | BP [Member]
Concentration Risk, Percentage	76.00%	85.00%
US Gulf Of Mexico [Member] | Geographic Concentration Risk [Member]
Revenues	$ 160.2	$ 338.8
US Gulf Of Mexico [Member] | Floaters [Member] | Geographic Concentration Risk [Member]
Concentration Risk, Percentage	84.00%	84.00%
ANGOLA | Geographic Concentration Risk [Member]
Revenues	$ 136.2	$ 169.3
ANGOLA | Floaters [Member] | Geographic Concentration Risk [Member]
Concentration Risk, Percentage	87.00%	90.00%
Brazil [Member] | Floaters [Member] | Geographic Concentration Risk [Member]
Revenues	$ 121.0	$ 122.7

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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